Converging jet cutting tip for cutting torches



p 24, 1929. c. J. COBERLY 1,729,206

V JET OUT I I Filed Sept. 29, 1925 f vl s TOE C/arence .Coberly PatentedSept. 24, 1929" UNITED STATES CLARFHVCE: J'. COBERLY, F LOS ANGELES,

.,MESNE ASSIGNMENTS, TO KOBE,

TION OF CALIFORNIA CALIFORNIA, ASSIGNOR, BY DIRECT AND INQ, OF LOSANGELES, CALIFORNIA, A "CORPORA- CONVERGING JET CUTTING TIP FOR CUTTINGTORCHES Application filed September 29, 1923. Serial No. 665,648. I

My invention relates to the art of cutting slots in metal plates, andparticularly to the art of cutting slots in oil Well casing.

It is generally necessary in the product on of oil to provide a steelcasing or pipe which extends from the surface of the ground down intothe oil sand, and which is perforated where it extends into the oil sandto allow the oil to pass therethrough, the perforations 9 through whichthe oil enters the well being sufficiently small to exclude thecoarsesand and gravel surrounding the casing. It-has been found that oil wellcasing can be economically perforated by means of an oxygen 3 cuttingtorch before being placed in the well. It has also been found that, itis highly desirable that the slots cut in the casing be of akeystone-shaped section, that is to say that the slots be narrower atthe outer surface of B the pipe than at the inner, as ithas been foundthat such slots are much less likely to clog -than slots having parallelsides.

It is an object of my invention to provide a peculiar form of cuttingtip and a new 5 method by which keystone-shaped slots: canfor a cuttingtorch embodying my invention in operation. I ln the form of my inventionshown, ll employ a tip 11 having a frusto conical headl2,

which is adapted to he secured in an oxygen" cutting torch in theconventional manner. Extending through the tip are four heating 5orifices 13 and two cutting orifices M. The

heating orifices 13 are supplied with a mixture of oxygen and acombustible gas in the usual manner, and the torch is so arranged as toalso supply oxygen to the cutting orifices 1a. A tip designed to cut oilwell casing 'torc may have the following dimensions the heating orifices'13 may have uniform diameter of .024 of an inch, the cutting orifices14 having a uniform diameter of .028 of an inch. The cutting orifices14, at the point where they emerge from the tip, preferably have acenter distance of .056'0f an inch, the angle between the cuttingorifices 14 being 3 degrees. Operating on inch material, that is tosaypipe which is inch thick,,it is possible to cut a slot 1 5; inch wideat the outside of the pipe and 5/64 inch wide at the inner surface ofthe pipe. 'lzhe converging jets 23 and 24 from the orifices 14 form afan-shaped jet 25, having its greatest dimensional; right angles to theplane of the paper as viewed in Fi 1. llhis flame, spreading as itleaves the tip, tends to undercut the pipe in the manner shown in Fig.3, producing the desired slot. 'lhis slot, as shown by Fig. 3, is ofkeystone .shape, that is, it is narrower at the outer surface of thepipe than at the inner surface, the sides and 21 being inclined .to eachother. This form of slot isparticularly'valuable when applied to oilwell casing, as material entering the slot through the narrow outeropening must pass through the slot and cannot lodge therein and clog theslot.

By forming theslots with a jet of definite form, it is possible to forma slot of uniform width and form throughout its length.

l have found that by cutting slots by my method, not only is a veryuniform slot produced, but the action of the cutting jet hardens thesurface of the metal and increases its strength. 4

ll claim'as my invention: 1. In a tip for cutting torcheameans forforming a plurality of jets of oxygen, said jetsficonverging so as tounite outside said tip.

I 2. lin a tip for cutting torches, means for forming a plurality ofjets of oxygen, said jets converging so as to intersect outside saidtorch tip, and unite in a single jet, opposite portions of whichdiverge.

3. A device for cutting keystone-shaped slots including a structurehaving a plurality of oxygen jet holes formed on axes which intersectata point located outside said structure.

4. A device for cutting keystone-shaped slots including a structurehaving'a plurality 5 of oxygen jet holes formed on axes which arerelatively inclined so that oxygen jets issuing therefrom collideoutside. said structure.

In testimony whereof, I have hereun'to'set my hand at Los Angeles,California, .v this 10 20th day of September, 1923. CLARENCE J. COBERLY

